Cable adjuster

Abstract

A cable adjuster contains a gear shaft, a base, a rotatable disc, and a cable. The gear shaft includes a first column, a second column, a circular peg, and a threaded orifice. The base includes a first fixer and a second fixer. The first fixer has a first groove, and the second fixer has a second groove. An accommodation chamber is defined between the first groove and the second groove, the first fixer has a toothed notch and a circular notch, and the second fixer has a hollow shoulder, two T-shaped slots, and two holders. The rotatable disc includes a fixing orifice, a cylinder, and a recess. A head of the cable is received in the second fixer via the two T-shaped slots and is engaged in the recess so that an extension is fixed in one holder, and the rotatable disc is received in the second groove.

What is claimed is: 
     
       1. A cable adjuster comprising a gear shaft, a base on which the gear shaft is connected, a rotatable disc driven by the gear shaft, and a cable pulled by rotating the rotatable disc;
 wherein the gear shaft includes a first column extending from a first end thereof, a second column extending from a second end of the gear shaft, a circular peg extending from the second column, and a threaded orifice defined in the circular peg; 
 wherein the base including a first fixer and a second fixer, the first fixer has a first groove defined thereon, and the second fixer has a second groove formed thereon and corresponding to the first groove, and when the first groove of the first fixer is connected with the second groove of the second fixer, an accommodation chamber is defined between the first groove and the second groove to accommodate the rotatable disc, the first fixer has a toothed notch and a circular notch connected with the toothed notch, the second fixer has a hollow shoulder extending from a center of a bottom thereof, two T-shaped slots defined on two sides of the bottom of the second fixer, and two holders arranged on a peripheral side of the second fixer; 
 wherein the rotatable disc includes a fixing orifice defined on a center thereof, a cylinder extending around the fixing orifice and corresponding to the second groove, and a recess defined outside a bottom of the cylinder; 
 wherein a head of the cable is received in the second fixer via the two T-shaped slots and is engaged in the recess of the rotatable disc, an extension is fixed in one of the two holders, and the rotatable disc is received in the second groove, then the first fixer and the second fixer are connected, wherein a spring is fitted on the circular peg of the gear shaft, and the gear shaft is inserted into the fixing orifice of the rotatable disc and the hollow shoulder of the second fixer, a screw element is screwed into the threaded orifice of the circular peg from the bottom of the second fixer, a gear of the gear shaft is engaged in the toothed notch, and the spring abuts against the hollow shoulder and the second column, then an adjustable knob is pressed to drive the gear shaft to move with respect to the base, and the spring is forced by the second column and the hollow shoulder, the gear moves downward to the circular notch to remove from the toothed notch, the adjustable knob is rotated to actuate the gear shaft and the rotatable disc to revolve on the base, and the cable extending out of the recess is winded around the cylinder when the rotatable disc rotates; after releasing the adjustable knob, the spring forces the gear to upwardly move back to an original position and to engage in the toothed notch. 
 
     
     
       2. The cable adjuster as claimed in  claim 1 , wherein the first fixer further has at least one limitation protrusion extending from an inner wall of the first groove hereof, and a defining plate includes at least one sector-shaped locating tab extending from a peripheral side thereof and configured to fit with a top of the rotatable disc, the second column of the gear shaft is inserted through a receiving orifice of the defining plate and the fixing orifice of the rotatable disc to be accommodated in the accommodation chamber of the base, when the defining plate rotates to a rotating angle, the at least one sector-shaped locating tab contacts with the at least one limitation protrusion, the rotating angle of the rotatable disc is limited.